IntersectionTests

Methods

staticIntersectionTests.grazingAltitudeLocation(ray, ellipsoid) → Cartesian

Provides the point along the ray which is nearest to the ellipsoid.

Name	Type	Description
ray	Ray	The ray.
ellipsoid	Ellipsoid	The ellipsoid.

Returns:

The nearest planetodetic point on the ray.

Source: Core/IntersectionTests.js, line 280

staticIntersectionTests.lineSegmentPlane(endPoint0, endPoint1, plane, result) → Cartesian3

Computes the intersection of a line segment and a plane.

Name	Type	Description
endPoint0	Cartesian3	An end point of the line segment.
endPoint1	Cartesian3	The other end point of the line segment.
plane	Plane	The plane.
result	Cartesian3	optional The object onto which to store the result.

Returns:

The intersection point or undefined if there is no intersection.

Example:

var origin = Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883);
var normal = ellipsoid.geodeticSurfaceNormal(origin);
var plane = Cesium.Plane.fromPointNormal(origin, normal);

var p0 = new Cesium.Cartesian3(...);
var p1 = new Cesium.Cartesian3(...);

// find the intersection of the line segment from p0 to p1 and the tangent plane at origin.
var intersection = Cesium.IntersectionTests.lineSegmentPlane(p0, p1, plane);

Source: Core/IntersectionTests.js, line 379

staticIntersectionTests.rayEllipsoid(ray, ellipsoid) → Object

Computes the intersection points of a ray with an ellipsoid.

Name	Type	Description
ray	Ray	The ray.
ellipsoid	Ellipsoid	The ellipsoid.

Returns:

An object with the first (start) and the second (stop) intersection scalars for points along the ray or undefined if there are no intersections.

Source: Core/IntersectionTests.js, line 81

staticIntersectionTests.rayPlane(ray, plane, result) → Cartesian3

Computes the intersection of a ray and a plane.

Name	Type	Description
ray	Ray	The ray.
plane	Plane	The plane.
result	Cartesian3	optional The object onto which to store the result.

Returns:

The intersection point or undefined if there is no intersections.

Source: Core/IntersectionTests.js, line 37

staticIntersectionTests.trianglePlaneIntersection(p0, p1, p2, plane) → Object

Computes the intersection of a triangle and a plane

Name	Type	Description
p0	Cartesian3	First point of the triangle
p1	Cartesian3	Second point of the triangle
p2	Cartesian3	Third point of the triangle
plane	Plane	Intersection plane

Returns:

An object with properties positions and indices, which are arrays that represent three triangles that do not cross the plane. (Undefined if no intersection exists)

Example:

var origin = Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883);
var normal = ellipsoid.geodeticSurfaceNormal(origin);
var plane = Cesium.Plane.fromPointNormal(origin, normal);

var p0 = new Cesium.Cartesian3(...);
var p1 = new Cesium.Cartesian3(...);
var p2 = new Cesium.Cartesian3(...);

// convert the triangle composed of points (p0, p1, p2) to three triangles that don't cross the plane
var triangles = Cesium.IntersectionTests.trianglePlaneIntersection(p0, p1, p2, plane);

Source: Core/IntersectionTests.js, line 440